Bake potatoes until tender. Split; scoop pulp into large bowl, discarding skins.
Melt 1/4 C butter and beat into potatoes.
Beat in eggs, milk, 1/4 cup brown sugar, bourbon, cinnamon, salt and nutmeg.
Spread into lightly greased 1 1/2 quart broiler safe casserole.
COmbine remaining 1/2 c brown sugar, oats and flour in a small bowl.
Cut in remaining 1/4 c butter until mixture is size of peas.
Stir in pecans. Sprinkle over potato mixture.
Bake in 350 oven for 30 minutes or until heated through. For crisper topping, broil 4-5 inches from heat for 3 min or until browned.